A class mate of mine went to work for John Deere in the early 1980's and re-designed a crank shaft in one of their engines. They were having problems with the crankshaft failing under warranty, costing the company money. So he made it 25% lighter and 400% stronger. His design was rejected as it would seriously cut into parts sales and service revenue for the dealers. In other words, they did not want it 25% lighter 400% stronger, they wanted it *just* strong enough to survive past the warranty period, then fail. Basically the classic designed obsolescence approach to marketing as adapted to really expensive farm machinery. To his credit, he took another job somewhere else.
In that regard, the Jet Fin is a serious *sales* problem as customers never wear them out, so repeat sales of fins are very low to Jet Fin owners. I haven't worn mine out in 28 years of diving, and I've never really found anything that works better - except perhaps the OMS Slipstream, which is just a lighter monoprene version of the Jet Fin. The Slipstream is most likely not nearly as durable, but it's lighter and that can be beneficial for proper trim in some configurations.
So...with Scubapro knowing full well that 1) Jet Fins last forever and will, along with cockroaches, eventually inherit the post apocalyptic earth, and 2) the percentage of sales revenue that dealers make off basic mask, fins and snorkel sales, my hat's off to Scubapro for continuing to produce the Jet Fin rather than discontinuing that superb fin just in order to boost sales and/or dealer profits made on repeat fin sales. That kind of thing buys my loyalty to the brand.